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Quarterly Financial Data (Unaudited) - Narratives (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Oct. 24, 2015
Jan. 27, 2018
Jul. 29, 2017
Jul. 30, 2016
Jul. 25, 2015
Jul. 15, 2015
Interim Period, Costs Not Allocable [Line Items]            
Tax Cuts and Jobs Act of 2017, adjustment to income tax liability   $ 32.2        
Tax benefit from exercise of stock options   $ 7.8        
Debt extinguishment cost $ 16.3          
7.125% Senior Subordinated Notes            
Interim Period, Costs Not Allocable [Line Items]            
Debt, interest rate (in percent) 7.125% 7.125% 7.125% 7.125%